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[CCID3]: Calculate the RTT in the RX half connection

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Using TIMESTAMP_ECHO and ELAPSED_TIME options received.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2005-08-23 21:51:59 -07:00 committed by David S. Miller
parent d4b81ff705
commit 4fded33b3e
1 changed files with 38 additions and 29 deletions
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67
net/dccp/ccids/ccid3.c
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@ -1010,7 +1010,6 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
struct timeval now;
// ccid3_pr_debug("%s, sk=%p, more=%d, len=%d\n", dccp_role(sk), sk, more, len);
BUG_ON(hctx == NULL);
if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
@ -1562,23 +1561,27 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
{
const struct dccp_sock *dp = dccp_sk(sk);
u32 x_recv, pinv;
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
return;
if (hcrx->ccid3hcrx_elapsed_time != 0 && !dccp_packet_without_ack(skb))
dccp_insert_option_elapsed_time(sk, skb, hcrx->ccid3hcrx_elapsed_time);
if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
const u32 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
const u32 pinv = htonl(hcrx->ccid3hcrx_pinv);
dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, &pinv, sizeof(pinv));
dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, &x_recv, sizeof(x_recv));
}
DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
if (dccp_packet_without_ack(skb))
return;
if (hcrx->ccid3hcrx_elapsed_time != 0)
dccp_insert_option_elapsed_time(sk, skb,
hcrx->ccid3hcrx_elapsed_time);
dccp_insert_option_timestamp(sk, skb);
x_recv = htonl(hcrx->ccid3hcrx_x_recv);
pinv = htonl(hcrx->ccid3hcrx_pinv);
dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
&pinv, sizeof(pinv));
dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
&x_recv, sizeof(x_recv));
}
/* Weights used to calculate loss event rate */
@ -1860,8 +1863,10 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
const struct dccp_options_received *opt_recv;
struct dccp_rx_hist_entry *packet;
struct timeval now;
u32 now_usecs;
u8 win_count;
u32 p_prev;
int ins;
@ -1876,24 +1881,25 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
opt_recv = &dp->dccps_options_received;
switch (DCCP_SKB_CB(skb)->dccpd_type) {
case DCCP_PKT_ACK:
if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
return;
case DCCP_PKT_DATAACK:
if (dp->dccps_options_received.dccpor_timestamp_echo == 0)
if (opt_recv->dccpor_timestamp_echo == 0)
break;
p_prev = hcrx->ccid3hcrx_rtt;
do_gettimeofday(&now);
/* hcrx->ccid3hcrx_rtt = now - dp->dccps_options_received.dccpor_timestamp_echo -
usecs_to_jiffies(dp->dccps_options_received.dccpor_elapsed_time * 10);
FIXME - I think above code is broken - have to look at options more, will also need
to fix pr_debug below */
now_usecs = now.tv_sec * USEC_PER_SEC + now.tv_usec;
hcrx->ccid3hcrx_rtt = now_usecs -
(opt_recv->dccpor_timestamp_echo -
opt_recv->dccpor_elapsed_time) * 10;
if (p_prev != hcrx->ccid3hcrx_rtt)
ccid3_pr_debug("%s, sk=%p, New RTT estimate=%lu jiffies, tstamp_echo=%u, elapsed time=%u\n",
dccp_role(sk), sk, hcrx->ccid3hcrx_rtt,
dp->dccps_options_received.dccpor_timestamp_echo,
dp->dccps_options_received.dccpor_elapsed_time);
ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
dccp_role(sk), hcrx->ccid3hcrx_rtt,
opt_recv->dccpor_elapsed_time);
break;
case DCCP_PKT_DATA:
break;
@ -1904,8 +1910,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
return;
}
packet = dccp_rx_hist_entry_new(ccid3_rx_hist,
dp->dccps_options_received.dccpor_ndp,
packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp,
skb, SLAB_ATOMIC);
if (packet == NULL) {
ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet to history (consider it lost)!",
@ -1930,9 +1935,9 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
case TFRC_RSTATE_DATA:
hcrx->ccid3hcrx_bytes_recv += skb->len - dccp_hdr(skb)->dccph_doff * 4;
if (ins == 0) {
do_gettimeofday(&now);
if ((now_delta(hcrx->ccid3hcrx_tstamp_last_ack)) >= hcrx->ccid3hcrx_rtt) {
hcrx->ccid3hcrx_tstamp_last_ack = now;
if (now_delta(hcrx->ccid3hcrx_tstamp_last_ack) >=
hcrx->ccid3hcrx_rtt) {
do_gettimeofday(&hcrx->ccid3hcrx_tstamp_last_ack);
ccid3_hc_rx_send_feedback(sk);
}
return;
@ -1946,8 +1951,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
}
/* Dealing with packet loss */
ccid3_pr_debug("%s, sk=%p(%s), skb=%p, data loss! Reacting...\n",
dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
dccp_role(sk), sk, dccp_state_name(sk->sk_state));
ccid3_hc_rx_detect_loss(sk);
p_prev = hcrx->ccid3hcrx_p;
@ -1985,7 +1990,11 @@ static int ccid3_hc_rx_init(struct sock *sk)
hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
INIT_LIST_HEAD(&hcrx->ccid3hcrx_loss_interval_hist);
/*
* XXX this seems to be paranoid, need to think more about this, for
* now start with something different than zero. -acme
*/
hcrx->ccid3hcrx_rtt = USEC_PER_SEC / 5;
return 0;
}